Bounds on the fine structure constant variability from Fe ii absorption lines in QSO spectraP. Molaro, D. Reimers, I. I. Agafonova and S. A. LevshakovEur. Phys. J. Special Topics, 163 (2008) 173-189DOI: https://doi.org/10.1140/epjst/e2008-00818-4